Thiruvananthapuram: An IT professional and his paramour, a married woman, have been arrested in connection with the murder of the latter`s four-year-old child and mother-in-law, police said.

Police said Nino Mathew hacked to death his paramour Anu Shanti`s daughter and mother-in-law and also made a vain attempt to murder her husband Lijesh on Wednesday.

The injured Lijesh ran out of the house and alerted neighbours, which led to Mathew`s arrest, police said.

Anu Shanti, Mathew`s colleague at an IT firm in Technopark here, who was arrested yesterday, was charged with conspiracy and abetment of crime, police said, adding, both have been remanded in judicial custody.